<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
  </div>
</template>

<script>
import {nanoid} from 'nanoid'
export default {
  name: "UserHeader",
  data(){
    return{
      title:''
    }
  },
  methods:{
    add(){
      //判断输入内容是否为空
      if(this.title === ''){
        alert("请勿输入空值！")
      }else{
        const todoItem = {id:nanoid(),name:this.title,completed:false}
        this.$emit('addTodo',todoItem)
        //传完数据后输入框值清空
        this.title=''
      }
    }
  }
}
</script>

<style scoped>
  /*header*/
  .todo-header input {
    width: 560px;
    height: 28px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 4px 7px;
  }

  .todo-header input:focus {
    outline: none;
    border-color: rgba(82, 168, 236, 0.8);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
  }
</style>